Baxendale, F.P. and Lippincott, C.L. and Teetes, G.L. (1983) Biology and seasonal abundance of hymenopterous parasites of sorghum midge (Diptera: Cecidomyiidae). Environmental Entomology, 12 (3). pp. 871-877.
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Abstract
During studies carried out in Burleston County, Texas, in 1980-81, 4 hymenopterous parasites of the sorghum pest Contarinia sorghicola (Coq.) were found; they were Eupelmus popa Gir., a species of Tetrastichus near T. venustus Gah., a species of Tetrastichus near T. blastophagi (Ashm.) and T. diplosidis (J.C. Crawford) (Aprostocetus diplosidis). E. popa and T. diplosidis were ectoparasitic on the pest in sorghum spikelets, while the species of Tetrastichus near T. venustus fed both externally and internally. Members of the parasite complex oviposited and developed into adults in spikelets containing immature midges between 1 and 18 days old (larvae and pupae). Most parasites developed from midges parasitised as mid-stage larvae. The time required for development from the egg stage to adult emergence ranged from 7 to 32 days for the parasite complex; most adults of the individual species emerged after 15-19 days, while the adult hosts emerged 15-18 days after oviposition. E. popa was most abundant during spring and early summer in both Johnson grass (Sorghum halepense) and sorghum. T. diplosidis reached its highest density in late summer and autumn. The species of Tetrastichus near T. venustus was primarily a mid-season parasite, while densities of that near T. blastophagi were relatively high during spring and summer. The latter species showed a preference for C. sorghicola infesting Johnson grass, while the species of Tetrastichus near T. venustus and T. diplosidis preferred midges infesting sorghum. During the course of the season, 20.0 and 8.2% of midges were parasitised in Johnson grass and sorghum, respectively
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Entomology, Texas A & M University, College Station, TX 77843, USA |
| Subjects: | Plant Protection > Pests |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 01 Mar 2012 03:45 |
| Last Modified: | 01 Mar 2012 03:45 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/3351 |
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